ACTA

Magnetic Properties of La_0.85Ag_0.15MnO₃ Nano-Powders Under Pressure

M. Antoňák^a, M. Mihalik^a, M. Zentková^a, M. Mihalik jr.^a,b, M. Vavra^a, J. Lazúrová^a, M. Fitta^c, M. Balanda^c
^aInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
^bInstitute of Chemistry, Faculty of Science, P. J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia
^cPolish Academy of Sciences, Radzikowskiego 152, Kraków, Poland

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In our paper we present effect of pressure on magnetic properties of La_0.85Ag_0.15MnO₃ nanopowders prepared by glycine-nitrate method. The particle size and crystal structure were modified by heat treatment. The average size of particle varies from about 25 nm for as prepared sample to 60 nm for annealed sample. Crystal structure changes from orthorhombic to rhombohedral after annealing at 600 °C/2 hours. The Curie temperature increases with annealing and is more than doubled after annealing at 600 °C/2 hours. The exchange bias phenomenon was observed in samples with orthorhombic crystal structure with average particle size of about 25 nm. Pressure effect on the Curie temperature T_C, saturated magnetization μ_s and exchange bias field H_E is negligible in this case. In the case of the samples with rhombohedral structure, T_C, μ_s and remnant magnetization μ_r increase with pressure; The coercive field decreases with pressure.

DOI: 10.12693/APhysPolA.126.296
PACS numbers: 75.50.-y, 75.50.Tt, 75.47.Lx, 75.30Kz